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Note 9 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Securities available for sale $ 470,090,000 $ 460,819,000
Equity securities (included in other assets) 1,600,000 1,500,000
Impaired loans 94  
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 82,306,000 83,863,000
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 8,947,000 9,353,000
US Government Agencies Debt Securities [Member]    
Securities available for sale 141,424,000 137,981,000
US Treasury and Government [Member]    
Securities available for sale 79,811,000 78,732,000
Municipal Notes [Member]    
Securities available for sale 157,602,000 150,890,000
Fair Value, Recurring [Member]    
Securities available for sale 470,090,000 460,819,000
Equity securities (included in other assets) 1,604,000 1,467,000
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 82,306,000 83,863,000
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 8,947,000 9,353,000
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 141,424,000 137,981,000
Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Securities available for sale 79,811,000 78,732,000
Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 157,602,000 150,890,000
Fair Value, Nonrecurring [Member]    
Impaired loans 26,000  
Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 68,000  
Fair Value, Inputs, Level 1 [Member]    
Impaired loans 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Securities available for sale 0 0
Equity securities (included in other assets) 1,604,000 1,467,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]    
Impaired loans 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 0  
Fair Value, Inputs, Level 2 [Member]    
Impaired loans 0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Securities available for sale 470,090,000 460,819,000
Equity securities (included in other assets) 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 82,306,000 83,863,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 8,947,000 9,353,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 141,424,000 137,981,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Securities available for sale 79,811,000 78,732,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 157,602,000 150,890,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]    
Impaired loans 0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Securities available for sale 0 0
Equity securities (included in other assets) 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 0 $ 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]    
Impaired loans 26,000  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans $ 68,000